Malicious PDF — malware analysis report

Static analysis result for SHA-256 41931d60c1cf67c6…

MALICIOUS

PDF

80.2 KB Created: 2021-05-12 12:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05572069ef4d6978792ad6c3f04ed0fb SHA-1: f2127d6fedd42ae32e120df20146a85c7ec41d4a SHA-256: 41931d60c1cf67c6b3a59501a744ea22e3c899db60deb1431b32f8cccc6e2056
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which can be abused to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/wb?keyword=how%20to%20work%20out%20training%20man%20days In PDF document text
    • https://static.s123-cdn-static.com/uploads/4402262/normal_5ff16e34b1a00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462096/normal_5fff3f6137a20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465145/normal_5ffae313c2a23.pdfIn PDF document text
    • http://siluvuxifebul.medianewsonline.com/zexogupogiledak.pdfIn PDF document text
    • http://pidawudimo.scienceontheweb.net/81325416895.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446015/normal_5ffe58f6a7404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486037/normal_602fbfdac629c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_3f9a63831dd14d4ca638f12b9b2ea126.pdf?index=trueIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_f4f49ec5b4064fbb95e0bff06ab89259.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pipaneku/bodyguard_songs_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/givazozesux.pdfIn PDF document text
    • http://rigidafavubo.myartsonline.com/kubatekopixulijemete.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/56021503741.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_173be877e47c4eabb0a1abd9952c9379.pdf?index=trueIn PDF document text
    • http://xasejumav.onlinewebshop.net/piano_arpeggio_finger_patterns.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/stock_android_mobile_phones_under_15000.pdfIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_ebc06fc761ca43b7919037e72bb016f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/jaxevefunakirikoper.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/rosukevokirumigen.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 5332 bytes
SHA-256: 6054b9b5daa9dbb9133fde53e75252647062047525618ba11826da1e4d63b2b7
font_01_sfnt_off00010e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1D 10984 bytes
SHA-256: b4deec8becdbf3c53b8d173578a72d6ae7ea2b08dcf532c1924b4ee0c5a214e1

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